1 Ding Qing rubber NBR: oil resistant performance is good, and most of the mineral base oil and grease compatibility. But it is not suitable for phosphate series hydraulic oil and gear oil additive containing polar, not resistant to aromatic hydrocarbons and chlorinated hydrocarbons, ketones, amines, fire resistant fluid HFD. Temperature: -40 ~ +120℃

2 fluorine rubber: FKM or FPM acid and other chemicals. Oil resistance (including phosphate series hydraulic oil), suitable for all lubricating oil, hydraulic oil, synthetic oil and gasoline, etc.. However, fuel resistant liquid HFD, hydrocarbons, aromatic hydrocarbons and chlorinated hydrocarbons and most inorganic acid mixture. Not resistant to ketones, amines, anhydrous ammonia, low molecular organic acids. For example: formic acid and acetic acid. Temperature: -20 ~ +260℃

Silicone rubber: PMQ or MVQ heat resistance, cold resistance, compression permanent deformation is small, but the mechanical strength is low, only for Yu Jing to seal. Temperature: -60 ~ +230℃

3 ptfe: PTFE Good chemical stability, heat resistance, cold resistance, oil resistance, water, gas, chemicals and other media. High mechanical strength, high pressure resistance, good wear resistance, low friction coefficient, good self-lubricating. PTFE has flow phenomenon of creep and cold duration under certain load under time increasing deformation continue to increase (have a great relationship with the phenomenon of temperature). Pure PTFE generally cannot be used as hydraulic sealing materials, only filled the PTFE to use, are the most commonly used bronze powder filled and filled with glass fiber, these fillers decrease the coefficient of thermal expansion, improve heat conduction ability, increase wear resistance, improve the resistance to cold flow properties (creep). PTFE is not flexible, so it is always with the rubber elastomer used together, they provide by the pretightening force is required to complete the perfect seal. Temperature: -180 ~ +260℃